[poppler] [PATCH] Fix handling of SIGINT in multithreaded regression tests

[Adam Reichold]

Hello,

The Python-based regtest framework currently faces a common problem of
multi-threaded Python programs: An non-timed join will block signals
like SIGINT, so that it becomes impossible to stop the program by
pressing Control + C or sending SIGINT.

However, since the threading in regtest is simple enough, there seems to
be a useful trick, i.e. using a separate terminator thread on which a
non-timed join is forwarded using a timed join. This way, sending SIGINT
will kill all daemon threads (including the terminator thread) and
interrupt the main thread. Since all our worker threads are daemon
threads and we need not particularly care about clean-up, the attached
patch should suffice to fix SIGINT for us.

Best regards, Adam.
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